Fix drawTiledPixmap() and texture-brush painting with high-DPR images

Although QPainter::drawImage()/drawPixmap() would render images scaled
according to their devicePixelRatio(), that would not happen for
drawTiledPixmap() and when using a textured brush. Implemented here,
in combination with the pending "High-dpi drawTiledPixmap (raster
paint engine)" commit.

[ChangeLog][QtGui] Fix drawTiledPixmap() and texture-brush painting with high-DPR images

Task-number: QTBUG-67248
Change-Id: I037e3f897fa708038a0222d3b0c61c7842d87961
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/gui/painting/qemulationpaintengine.cpp b/src/gui/painting/qemulationpaintengine.cpp
index e6686e3721..49ecd3b318 100644
--- a/src/gui/painting/qemulationpaintengine.cpp
+++ b/src/gui/painting/qemulationpaintengine.cpp
@@ -101,6 +101,14 @@ void QEmulationPaintEngine::fill(const QVectorPath &path, const QBrush &brush)
             real_engine->fill(path, copy);
             return;
         }
+    } else if (style == Qt::TexturePattern) {
+        qreal dpr = qHasPixmapTexture(brush) ? brush.texture().devicePixelRatioF() : brush.textureImage().devicePixelRatioF();
+        if (!qFuzzyCompare(dpr, 1.0)) {
+            QBrush copy = brush;
+            combineXForm(&copy, QRectF(0, 0, 1.0/dpr, 1.0/dpr));
+            real_engine->fill(path, copy);
+            return;
+        }
     }
 
     real_engine->fill(path, brush);